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authorJohn Högberg <[email protected]>2018-07-03 13:16:33 +0200
committerJohn Högberg <[email protected]>2018-07-03 14:33:41 +0200
commit095c832e1d644c85e452527ffae43dce34b5075e (patch)
treeb089d177be43f8c75c1b9610c8fecebb36aa0217 /erts/emulator/sys
parenta09907d56e29b24ded9a34de82bceac7f39021d1 (diff)
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Use fallback pollset for stdin and friends when using kqueue
This is a hack to make the "noshell" option work; kqueue can poll these fds but will not report EV_EOF. This may be common to all all pipes but we have no way to tell whether an fd is a pipe or not.
Diffstat (limited to 'erts/emulator/sys')
-rw-r--r--erts/emulator/sys/common/erl_poll.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/erts/emulator/sys/common/erl_poll.c b/erts/emulator/sys/common/erl_poll.c
index 70b5532af9..b4d1575ee5 100644
--- a/erts/emulator/sys/common/erl_poll.c
+++ b/erts/emulator/sys/common/erl_poll.c
@@ -803,6 +803,23 @@ update_pollset(ErtsPollSet *ps, int fd, ErtsPollOp op, ErtsPollEvents events)
struct kevent evts[2];
struct timespec ts = {0, 0};
+ if (op == ERTS_POLL_OP_ADD) {
+ /* This is a hack to make the "noshell" option work; kqueue can poll
+ * these fds but will not report EV_EOF, so we return NVAL to use the
+ * fallback instead.
+ *
+ * This may be common to all pipes but we have no way to tell whether
+ * an fd is a pipe or not. */
+ switch (fd) {
+ case STDIN_FILENO:
+ case STDOUT_FILENO:
+ case STDERR_FILENO:
+ return ERTS_POLL_EV_NVAL;
+ default:
+ break;
+ }
+ }
+
#if defined(EV_DISPATCH) && !defined(__OpenBSD__)
/* If we have EV_DISPATCH we use it, unless we are on OpenBSD as the
behavior of EV_EOF seems to be edge triggered there and we need it